[kh99]

I don't know of an example, but it looks like you could do something like:

$title = $this->fetch_field('title');

// Do your check, and if changed....

$this->set('title', $title);

assuming that "title" is the field you want, of course. I didn't see anything else that looked like a description, but if you look at the top of includes/class_dm_rssfeed.php there's a list of fields.